Question

what is the electron configuration of the element in period 2 that has 6 valence electrons?
a he2s²2p²
b 1s²2s²2p⁴
c ne2s²2p⁴
d 1s²2s²2p⁶
e ne2s²2p²

Explanation:

Step1: Identify the element

Elements in period 2 have electrons in 1s, 2s and 2p orbitals. An element with 6 valence - electrons in period 2 is oxygen.

Step2: Write the electron - configuration

The atomic number of oxygen is 8. Its electron - configuration is $1s^{2}2s^{2}2p^{4}$.

Answer:

B. $1s^{2}2s^{2}2p^{4}$